Ultimately, a lot was wrong with the old gameplay style. A lot of things were getting in the way of new development, and we had backed ourselves into a corner.
As we were developing the Ancients, we quickly learned that the gameplay leaned pretty heavily on the viability of certain techs and other things. Forest chopping is very powerful, whaling is powerful, custom houses are powerful, and instead of continually trying to bend around them, we just decided to do what needed to be done.
Ports were made cheaper in order to get people on the water faster and to encourage a better flow/integration of naval stuff.
We changed Custom Houses because we didn't want a building of that power being naval only. They were defining the economy too much and were too restricting. You either have spaces for them or you don't, and we wanted something better. Also, since Ports were now cheaper, the formula for CH's didn't apply anymore, so they had to be changed anyway.
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